The arachnoid mater (or simply arachnoid) is one of the three meninges, the protective membranes that cover the brain and spinal cord. It is so named because of its resemblance to a spider web.

Nov 6, 2025 · The arachnoid mater is the middle layer of the meninges, lying directly underneath the dura mater. It consists of layers of connective tissue, is avascular, and does not receive any innervation.

The arachnoid mater is the second layer of the meninges, situated internally to the dura mater. It envelops the brain and spinal cord, forming a delicate and transparent membrane.

Sep 18, 2025 · An arachnoid cyst is a noncancerous fluid-filled sac that grows on your brain or spinal cord. Most of the time, it’s something you were born with. It’s rare to cause symptoms or need …

Feb 15, 2024 · The arachnoid mater is named for its spiderweb-like appearance and is a thin transparent membrane encasing the brain and spinal cord like a loosely fitting sac.

Sep 30, 2024 · The arachnoid layer, along with the other meninges, forms part of the blood-brain barrier. This selective fortress keeps harmful substances out of the brain while allowing essential nutrients to …

Sep 10, 2024 · Arachnoiditis is a pain disorder that develops when the arachnoid becomes inflamed. It is characterized by severe stinging, burning pain, and neurological problems.